Rolling mills, with cooling means, for the treatment of pulverulent and granular materials, particularly metals



Aug. 17, 1965 u. GEIER 3,200,441

ROLLING MILLS, WITH COOLING MEANS, FOR THE TREATMENT OF PULVERULENT AND GRANULAR MATERIALS, PARTICULARLY METALS Filed Dec. 4, 1963 W F CM a= w 1% N f m k IN V EN TOR.

United States Patent 3,200,441 RQLLENG MILLS, WITH COOLING- MEANS, FOR THE TREATMENT OF PULVERULENT AND GULAR MATERIALS, PARTICU- LARLY METALS Ult Geier, Osterrath-Bovert, Germany, assignor to Schloemann Aktiengesellschait, Dusseldorf, Germany Filed Dec. 4, 1963, Ser. No. 327,949 Claims priority, application Germany, Dec. 24, 1962, Sch 32,517 3 Claims. (U. 18-9) This invention relates to a rolling mill, with means for cooling the rolls, for the treatment of granular or pulverulent materials. The rolls of such mills are usually moistened from the exterior with a cooling liquid, such as water. Since the cooling liquid ought not to come into contact with the material that is being rolled, precaution must be taken to free the rolls from the cooling liquid after they have been moistened with the latter. In order to obviate these expensive precautions it would therefore be advantageous to cool the rolls of such rolling mills internally. With the suggestions that have become known up to the present for the internal cooling of rolls, however, such an intensive cooling of the roll surface as of course occurs with external cooling is not attainable. This is to be attributed to the fact that having regard to the strength of the rolls, the bore extending along the roll axis for the supply and discharge of the cooling medium can only be made with a comparatively small crosssectional area, and consequently the area of the wall surface of the bore that serves for withdrawing heat from the liquid is a great deal less than the area of the external wall surface of the roll, which is absorbing heat.

The aim of the invention is to provide a rolling mill with cooling means which will permit an internal cooling of the rolls, but with a substantially better cooling effect than has hitherto been possible with such rolling mills.

According to the invention, this result is attained by surrounding each roll loosely with a sleeve or jacket and passing cooling liquid through the crescent-shaped space thus obtained between the roll and the sleeve. Since the internal surface of the roll sleeve is nearly as large as its external surface, and since furthermore its wall thickness is but small, a better cooling effect is yielded according to this invention than with external cooling owing to the cooling possibility being more intensive.

Both ends of each roll sleeve may advantageously be closed by stationary annular plates provided with inlets and outlets for the cooling medium. In this way a cooling chamber closed in itself is provided, whereby the risk of the cooling medium coming into contact with the material that is being rolled is prevented.

In order to prevent the roll sleeves tilting or canting relatively to the rolls, they may be guided by supporting rollers engaging their peripheries.

In order to obtain a driving connection of each roll with its roll sleeve, the latter may be provided at one of its ends with internal teeth, with which there mesh external teeth provided on the roll.

One embodiment of the invention is illustrated by way of example in the accompanying drawings, in which:

FIGURE 1 shows a pair of rolls in cross section; and

Ice

FIGURE 2 shows the same pair of rolls in longitudinal section.

The upper roll 1 and the lower roll'2 are each surrounded by a roll sleeve or jacket, 3 or 4 respectively. Each crescent shaped space 8 surrounded by a roll sleeve is shut off at the ends from the exterior by two stationary anular plates 5, which surround the roll journals in a fiuidtight manner. On these plates, inlets 6 and 7 and outlets 9 and 10 are provided for the admission and discharge of a cooling medium. With internal teeth 3a and 4a at one end of the roll sleeves there mesh positively external teeth In and 2a of the rolls 1 and 2 respectively, so that the peripheral speed of the rolls agrees approximately with the peripheral speed of the roll sleeves.

By supporting rollers 11, which are arranged on the periphery of each roll sleeve, and which are preferably provided at both ends of each sleeve, .a tilting or canting of the roll sleeves 3 and 4 relatively to the rolls 1 and 2, is prevented, and thus any impairing of the rolled products is obviated.

I claim:

1. A rolling mill, with means for cooling the rolls, for the treatment of pulverulent and granular substances, particularly metals, comprising: a roll sleeve eccentrically surrounding each roll, the internal diameter of each roll sleeve being greater than the external diameter of the roll that encloses, each roll engaging its associated roll sleeve along a generating line in a plane containing the axes of the roll and of the roll sleeve, and thus forming a crescent-shaped space between the roll and the roll sleeve, guiding means, independent of the roll, for each roll sleeve, a positive driving connection between each roll and its roll sleeve so that one is driven by the other, stationarily arranged anular end plates closing the crescent-shaped space between each roll and its roll sleeve the said end plates each engaging the associated roll in a fluidtight manner, inlet connections for admitting cooling liquid to the crescent-shaped spaces, and outlet connections for discharging the liquid therefrom.

2. A rolling mill as claimed in claim 1, the guiding means for each roll sleeve being a group of supporting rollers engaging its peripheral surface.

3. A rolling mill as claimed in claim 1, the driving connection between each roll and its roll sleeve consisting of internal teeth, at least at one end of each roll sleeve, and. external teeth meshing therewith at the end of the associated roll.

References Cited by the Examiner UNITED STATES PATENTS 1,330,434 2/20 Ekberg.

1,931,759 10/33 Hasing.

2,391,638 12/45 Meakin 18-12 2,956,348 10/60 Mueller -89 2,973,946 3/61 Bauling et al. 16588 3,004,289 10/61 Missbach 1810 3,034,173 5/62 Worn et al. 18-9 3,116,787 1/64 Campbell 18-9 XR WILLIAM J. STEPHENSON, Primary Examiner. 

1. A ROLLING MILL, WITH MEANS FOR COOLING THE ROLLS, FOR THE TREATMENT OF PULVERULENT AND GRANULAR SUBSTANCES, PARTICULARLY METALS, COMPRISING: A ROLL SLEEVE ECCENTRICALLY SURROUNDING EACH ROLL, THE INTERNAL DIAMETER OF EACH ROLL SLEEVE BIENG GREATER THAN THE EXTERNAL DIAMETER OF THE ROLL THAT ENCLOSES, EACH ROLL ENGAGING ITS ASSOCIATED ROLL SLEEVE ALONG A GENERATING LINE IN A PLANE CONTAINING THE AXES OF THE ROLL AND OF THE ROLL SLEEVE, AND THUS FORMING A CRESCENT-SHAPED SPACE BETWEEN THE ROLL AND THE ROLL SLEEVE, GUIDING MEANS, INDEPENDENT OF THE ROLL, FOR EACH ROLL SLEEVE, A POSITIVE DRIVING CONNECTION BETWEEN EACH ROLL AND ITS ROLL SLEEVE SO THAT ONE IS DRIVEN BY THE OTHER, STATIONARILY ARRANGED ANULAR END PLATES CLOSING THE CRESCENT-SHAPED SPACE BETWEEN EACH ROLL AND ITS ROLL SLEEVE THE SAID END PLATES EACH ENGAGING THE ASSOCIATED ROLL IN A FLUIDITIGHT MANNER, INLET CONNECTIONS FOR ADMITTING COOLING LIQUID TO THE CRESCENT-SHAPED SPACES, AND OUTLET CONNECTIONS FOR DISCHARGING THE LIQUID THEREFROM. 